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三角法/加法和減法定理
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來自 Wikibooks，面向開放世界的開放書籍
<
三角法
此頁面可能需要
稽核
其質量。
恆等式
1. 如果 T
n
= sin
n
+ cos
n
，則 T
5
- T
1
= ？
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書籍：三角法
華夏公益教科書
